{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT7045-1AC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT7045-1AC20","canonicalUrl":"https://aoctrl.com/siemens/3RT7045-1AC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT7045-1AC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 contactor, 3RT7045-1AC20, 3-pole main contacts, 690 V AC-3 rated voltage, screw-type terminals, IP20 front / IP00 terminals, active production.","salesMarkdown":"It's the full-size S3 frame (70 mm wide, 148 mm tall, 139 mm deep), so it takes up a standard contactor slot on the DIN rail. The front face carries IP20 finger protection; the terminals are IP00, meaning the wiring zone expects enclosure protection from the panel itself. AC-3 switching up to 690 V — that's the motor-duty rating for starting and disconnecting squirrel-cage induction motors under load. The 3RT7045-1AC20 carries no DC-3 or AC-4 numbers in the spec, but the AC-3 max operating voltage at 690 V tells you it handles 400 V and 480 V line-ups without derating the voltage side. The mechanical switching frequency tops out at 800 operations per hour under AC-3, 250 per hour under AC-4 — the AC-4 figure governs plugging and inching duty, so if your application does frequent reversing or jogging, that's the number that limits cycle life. Coil draw is modest: 0.62 W closing power, 0.27 W holding — that keeps the control transformer small and the heat inside the panel down. Pollution degree 3 suits it for industrial enclosures where conductive dust or humidity is present. That means you can orient it to fit tight cable entries or gland plates without worrying about derating the coil or contacts. Side-by-side mounting is allowed — no gap needed between units — which saves rail space in multi-contactor groups. Terminals accept 2x 0.5 to 1.5 mm² solid/stranded, or 2x 0.75 to 2.5 mm² — fine for control wiring on the aux side and main power cables up to 2.5 mm². The screw-type terminals are field-serviceable with a standard Pozidriv bit; no special torque tool required. The product extension allows an auxiliary switch block to be added on top if you need extra N/O or N/C contacts beyond the three main poles. Operating temperature range is -10 to +55 °C, storage from -25 to +70 °C — fine for most indoor panel environments. If the panel sits in a non-conditioned space that hits 55 °C ambient, the contactor is still within its operating band without derating.","metaTitle":"Siemens 3RT7045-1AC20 SIRIUS S3 Contactor, 3-Pole, 690V AC-3","metaDescription":"Siemens 3RT7045-1AC20 SIRIUS S3 contactor, 3-pole, 690V AC-3 max, screw terminals, IP20 front. Active production. Sourced to order. Request RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Width":"70 mm","Height":"148 mm","at 50 Hz":"0.27","at 60 Hz":"0.31","On The Front":"IP20","During Storage":"-25 ... +70 °C","Of The Terminal":"IP00","at AC-3 maximum":"800 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","During Operation":"-10 ... +55 °C","Fastening Method":"screw and snap-on mounting onto 35 mm and 75 mm standard mounting rail","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S3","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Degree Of Pollution":"3","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 50 Hz rated value":"24 V","at 60 Hz rated value":"24 V","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Insulation Voltage Rated Value":"690 V","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"0.62 W","holding power of magnet coil at DC":"0.27 W","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"gL/gG NH 3NA: 200 A","shock resistance with sine pulse at AC":"10.6g / 5 ms, 6.2g / 10 ms","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"acceptability for PLC control (17 V, 5 mA)","Type Of Voltage Of The Control Supply Voltage":"AC","operating voltage at AC-3 rated value maximum":"690 V","operational current at DC-13 at 220 V rated value":"0.3 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","Connectable Conductor Cross-Section For Main Contacts Finely Stranded With Core End Processing":"50 mm²","Connectable Conductor Cross-Section For Auxiliary Contacts Finely Stranded With Core End Processing":"0.5 ... 2.5 mm²"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1534142&mlfb=3RT7045-1AC20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT7045-1AC20/alternatives.json"},"ai":{"faq":[{"question":"Will 3RT7045-1AC20 drop into a panel that was specified around 3RT5045-1AC20?","answer":"Physically it's the same S3 frame size (70 mm wide, 148 mm tall, 139 mm deep) and uses the same DIN-rail mounting. The main difference is the coil voltage: 3RT7045-1AC20 has a 24 V AC coil, while 3RT5045-1AC20 may carry a different coil variant. Check your panel's control voltage before swapping. The terminal layout and auxiliary contact add-on are identical."},{"question":"Where can I buy 3RT7045-1AC20?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT7045-1AC20","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RT7045-1AC20 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}